AN EXPERIMENTAL INVESTIGATION OF GASEOUS FLOW CHARACTERISTICS IN MICROCHANNELS
- 1 April 2002
- journal article
- research article
- Published by Taylor & Francis in Microscale Thermophysical Engineering
- Vol. 6 (2), 117-130
- https://doi.org/10.1080/10893950252901268
Abstract
The microchannel is one of the essential components for the construction of various micro systems. However, it has been reported that the flow and heat transfer behavior in a microchannel deviates from predictions based on the conventional assumption generally accepted in macro-scale channels. Frictional characteristics of nitrogen and helium flows in three different microchannels (hydraulic diameter range 3-10 w m) have been investigated experimentally. The frictional resistance of gaseous flow in a trapezoidalcross-section microchannel was observed to be smaller than that in the conventional-sized channel. The reduced frictional resistance in microchannels is caused by the rarefaction effect due to extremely small dimensions of flow passages. By using Maxwell's first-order slip boundary condition, we can well predict the mass flow rate through microchannels and the friction constant.Keywords
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